Packages files won't work

I'm not known with adding Custom Content (CC).
But maybe this helps:

The Sims 4

In The Sims 4, there are two custom content folders: Tray for lots and Sims, and Mods for other content. Both of these folders are located in:
Windows XP:Documents and Settings\(Your User Account)\My Documents\Electronic Arts\The Sims 4\
Windows Vista, Windows 7/8, Mac:Users\(Your User Account)\Documents\Electronic Arts\The Sims 4\

The Mods folder may contain sub-folders. If the Mods folder does not exist, it can be created manually. The Mods folder will contain a file named resource.cfg . If it is deleted, the game should recreate it.

Most content uses the .package extension, though the format is different from that used in The Sims 2 and The Sims 3. As in The Sims 2, installing package files is simply a matter of placing them in the Mods folder, or a sub-folder of it; there is no need to do anything to the files other than place them. However, the archive file should not be placed in the Tray folder.

Lots and Sims use several different types of files. Both use a type known as .trayitem . Lots also use .blueprint and .bpifiles, while Sims use .hhi, .sgi and .householdbinary files. These files can be installed by extracting them from the archive file they are in, and placing them in the Tray folder; there is no need to do anything else to them.

Script mods, which use the .pyo extension, are a special case. Unlike other content files in the series, which will not work if they are inside an archive file, these files must remain zipped in order to work. Therefore, installing a script mod involves placing the zip file in the Mods folder. Also, script mods must be specifically enabled in Game Options.

Source: http://sims.wikia.com/wiki/Game_guide:Installing_custom_content